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To create a dictionary yourself, you could download a copy of the UMLS Metathesaurus and build upon the program mentioned above to create a Lucene index of the desired vocabulary.
Alternatively, you could use a different program in that same package that reads create a Lucene index from a pipe-delimited file :\\
by using a different program (scripts/java/org/apache/ctakes/dictionary/lookup/tools to create a Lucene index/CreateLuceneIndexFromDelimitedFile.java) in that same package.